[PATCH v8 11/46] x86, mm: Fixup code testing if a pfn is direct mapped
From: Jacob Shin
Update code that previously assumed pfns [ 0 - max_low_pfn_mapped ) and
[ 4GB - max_pfn_mapped ) were always direct mapped, to now look up
pfn_mapped ranges instead.
-v2: change applying sequence to keep git bisecting working.
so add dummy pfn_range_is_mapped(). - Yinghai Lu
Signed-off-by: Jacob Shin
Signed-off-by: Yinghai Lu
---
arch/x86/include/asm/page_types.h |8
arch/x86/kernel/cpu/amd.c |8 +++-
arch/x86/platform/efi/efi.c |7 +++
3 files changed, 14 insertions(+), 9 deletions(-)
diff --git a/arch/x86/include/asm/page_types.h
b/arch/x86/include/asm/page_types.h
index e21fdd1..45aae6e 100644
--- a/arch/x86/include/asm/page_types.h
+++ b/arch/x86/include/asm/page_types.h
@@ -51,6 +51,14 @@ static inline phys_addr_t get_max_mapped(void)
return (phys_addr_t)max_pfn_mapped << PAGE_SHIFT;
}
+static inline bool pfn_range_is_mapped(unsigned long start_pfn,
+ unsigned long end_pfn)
+{
+ return end_pfn <= max_low_pfn_mapped ||
+ (end_pfn > (1UL << (32 - PAGE_SHIFT)) &&
+ end_pfn <= max_pfn_mapped);
+}
+
extern unsigned long init_memory_mapping(unsigned long start,
unsigned long end);
diff --git a/arch/x86/kernel/cpu/amd.c b/arch/x86/kernel/cpu/amd.c
index f7e98a2..9619ba6 100644
--- a/arch/x86/kernel/cpu/amd.c
+++ b/arch/x86/kernel/cpu/amd.c
@@ -676,12 +676,10 @@ static void __cpuinit init_amd(struct cpuinfo_x86 *c)
* benefit in doing so.
*/
if (!rdmsrl_safe(MSR_K8_TSEG_ADDR, )) {
+ unsigned long pfn = tseg >> PAGE_SHIFT;
+
printk(KERN_DEBUG "tseg: %010llx\n", tseg);
- if ((tseg>>PMD_SHIFT) <
- (max_low_pfn_mapped>>(PMD_SHIFT-PAGE_SHIFT)) ||
- ((tseg>>PMD_SHIFT) <
- (max_pfn_mapped>>(PMD_SHIFT-PAGE_SHIFT)) &&
- (tseg>>PMD_SHIFT) >= (1ULL<<(32 - PMD_SHIFT
+ if (pfn_range_is_mapped(pfn, pfn + 1))
set_memory_4k((unsigned long)__va(tseg), 1);
}
}
diff --git a/arch/x86/platform/efi/efi.c b/arch/x86/platform/efi/efi.c
index ad44391..36e53f0 100644
--- a/arch/x86/platform/efi/efi.c
+++ b/arch/x86/platform/efi/efi.c
@@ -835,7 +835,7 @@ void __init efi_enter_virtual_mode(void)
efi_memory_desc_t *md, *prev_md = NULL;
efi_status_t status;
unsigned long size;
- u64 end, systab, end_pfn;
+ u64 end, systab, start_pfn, end_pfn;
void *p, *va, *new_memmap = NULL;
int count = 0;
@@ -888,10 +888,9 @@ void __init efi_enter_virtual_mode(void)
size = md->num_pages << EFI_PAGE_SHIFT;
end = md->phys_addr + size;
+ start_pfn = PFN_DOWN(md->phys_addr);
end_pfn = PFN_UP(end);
- if (end_pfn <= max_low_pfn_mapped
- || (end_pfn > (1UL << (32 - PAGE_SHIFT))
- && end_pfn <= max_pfn_mapped)) {
+ if (pfn_range_is_mapped(start_pfn, end_pfn)) {
va = __va(md->phys_addr);
if (!(md->attribute & EFI_MEMORY_WB))
--
1.7.7
--
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[PATCH v8 11/46] x86, mm: Fixup code testing if a pfn is direct mapped
From: Jacob Shin jacob.s...@amd.com
Update code that previously assumed pfns [ 0 - max_low_pfn_mapped ) and
[ 4GB - max_pfn_mapped ) were always direct mapped, to now look up
pfn_mapped ranges instead.
-v2: change applying sequence to keep git bisecting working.
so add dummy pfn_range_is_mapped(). - Yinghai Lu
Signed-off-by: Jacob Shin jacob.s...@amd.com
Signed-off-by: Yinghai Lu ying...@kernel.org
---
arch/x86/include/asm/page_types.h |8
arch/x86/kernel/cpu/amd.c |8 +++-
arch/x86/platform/efi/efi.c |7 +++
3 files changed, 14 insertions(+), 9 deletions(-)
diff --git a/arch/x86/include/asm/page_types.h
b/arch/x86/include/asm/page_types.h
index e21fdd1..45aae6e 100644
--- a/arch/x86/include/asm/page_types.h
+++ b/arch/x86/include/asm/page_types.h
@@ -51,6 +51,14 @@ static inline phys_addr_t get_max_mapped(void)
return (phys_addr_t)max_pfn_mapped PAGE_SHIFT;
}
+static inline bool pfn_range_is_mapped(unsigned long start_pfn,
+ unsigned long end_pfn)
+{
+ return end_pfn = max_low_pfn_mapped ||
+ (end_pfn (1UL (32 - PAGE_SHIFT))
+ end_pfn = max_pfn_mapped);
+}
+
extern unsigned long init_memory_mapping(unsigned long start,
unsigned long end);
diff --git a/arch/x86/kernel/cpu/amd.c b/arch/x86/kernel/cpu/amd.c
index f7e98a2..9619ba6 100644
--- a/arch/x86/kernel/cpu/amd.c
+++ b/arch/x86/kernel/cpu/amd.c
@@ -676,12 +676,10 @@ static void __cpuinit init_amd(struct cpuinfo_x86 *c)
* benefit in doing so.
*/
if (!rdmsrl_safe(MSR_K8_TSEG_ADDR, tseg)) {
+ unsigned long pfn = tseg PAGE_SHIFT;
+
printk(KERN_DEBUG tseg: %010llx\n, tseg);
- if ((tsegPMD_SHIFT)
- (max_low_pfn_mapped(PMD_SHIFT-PAGE_SHIFT)) ||
- ((tsegPMD_SHIFT)
- (max_pfn_mapped(PMD_SHIFT-PAGE_SHIFT))
- (tsegPMD_SHIFT) = (1ULL(32 - PMD_SHIFT
+ if (pfn_range_is_mapped(pfn, pfn + 1))
set_memory_4k((unsigned long)__va(tseg), 1);
}
}
diff --git a/arch/x86/platform/efi/efi.c b/arch/x86/platform/efi/efi.c
index ad44391..36e53f0 100644
--- a/arch/x86/platform/efi/efi.c
+++ b/arch/x86/platform/efi/efi.c
@@ -835,7 +835,7 @@ void __init efi_enter_virtual_mode(void)
efi_memory_desc_t *md, *prev_md = NULL;
efi_status_t status;
unsigned long size;
- u64 end, systab, end_pfn;
+ u64 end, systab, start_pfn, end_pfn;
void *p, *va, *new_memmap = NULL;
int count = 0;
@@ -888,10 +888,9 @@ void __init efi_enter_virtual_mode(void)
size = md-num_pages EFI_PAGE_SHIFT;
end = md-phys_addr + size;
+ start_pfn = PFN_DOWN(md-phys_addr);
end_pfn = PFN_UP(end);
- if (end_pfn = max_low_pfn_mapped
- || (end_pfn (1UL (32 - PAGE_SHIFT))
-end_pfn = max_pfn_mapped)) {
+ if (pfn_range_is_mapped(start_pfn, end_pfn)) {
va = __va(md-phys_addr);
if (!(md-attribute EFI_MEMORY_WB))
--
1.7.7
--
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